title: Usefulness of three-dimensional computed tomography for anatomic liver resection: sub-subsegmentectomy.
abstract: BACKGROUND
  Precise subtotal hepatectomies based on the vascular anatomy revealed by preoperative three-dimensional computed tomography (3D-CT) were reviewed to examine the usefulness of 3D-CT.
  
  
  METHODS
  The clinical records and 3D-CT images of 20 patients with 24 hepatomas less than 50 mm in diameter who underwent hepatectomy for hepatocellular carcinoma and metastatic tumors and the usefulness of 3D-CT were assessed. Couinaud's classification of liver subsegments and Takayasu's classification of sub-subsegments were used as the criteria for the anatomic division.
  
  
  RESULTS
  The accuracy in localizing tumors in a small subsegment of the liver was 75% (18 of 24 tumors) for conventional CT and 100% (24 of 24 tumors) for 3D-CT (p < 0.05). 3D-CT images made it possible to perform complete resection confined to the portal unit containing the tumor in patients with poor liver function. This method allowed complete preservation of the circulation of the remnant liver, thus reducing complications.
  
  
  CONCLUSIONS
  The 3D-CT technique provides more accurate diagnosis and a realistic virtual image of a tumor's location in the liver and so makes possible the anatomic resection of the liver. Because diagnostic errors could result in such clinical complications as postoperative bile leakage, this is a useful technique for hepatectomy, especially for sub-subsegmentectomy.
authors.affiliation: Second Department of Surgery, Yokohama City University School of Medicine, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Togo
authors.forename: H
authors.initials: H
authors.lastname: Shimada
authors.forename: E
authors.initials: E
authors.lastname: Kanemura
authors.forename: R
authors.initials: R
authors.lastname: Shizawa
authors.forename: I
authors.initials: I
authors.lastname: Endo
authors.forename: T
authors.initials: T
authors.lastname: Takahashi
authors.forename: K
authors.initials: K
authors.lastname: Tanaka
mesh_terms: D000368:Aged; D006528:Carcinoma, Hepatocellular / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery*; D005260:Female; D006498:Hepatectomy / Q000379:methods*; D006801:Humans; D008113:Liver Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D011183:Postoperative Complications / Q000453:epidemiology; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed